CVE-2026-54099

HIGHPre-NVD 8.88.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-22. A secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — Patch released this week
8.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in the Windows Machine Config Operator (WMCO) for Red Hat OpenShift Container Platform. The WICD CSR auto-approver validates that a Certificate Signing Request contains the organization system:wicd-nodes but does not reject additional organization values such as system:masters. A compromised Windows worker node that holds WICD credentials can submit a CSR that is auto-approved and signed by the cluster, yielding a client certificate that grants cluster-administrator privileges and enabling full cluster takeover.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity88% × 45%
The EG Score, 8.8 of 10.
Exploitation0.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
1st
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

June 22, 2026

Last Modified

October 14, 2026

Advisory Details (2)

Auto-updated Jun 22, 2026
Patch available. Sources: redhat.
Red Hat

2487950 – (CVE-2026-54099) CVE-2026-54099 windows-machine-config-operator: windows-machine-config-operator: WICD CSR extra-Organization allows privilege escalation to system:masters

https://bugzilla.redhat.com/show_bug.cgi?id=2487950
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-54099

Vendor Advisories for CVE-2026-54099(4)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatopenshift4-wincw/windows-machine-config-rhel9-operator:17890756152026-10-12redhat
redhatopenshift4-wincw/windows-machine-config-rhel9-operator:17870657082026-08-31redhat
redhatopenshift4-wincw/windows-machine-config-rhel9-operator:17836928002026-07-28redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 40× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 323 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 223 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  2. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  3. 2026-10-14 03:29 UTCEG score recompute
  4. 2026-10-14 03:29 UTCVendor advisory
  5. 2026-10-14 03:28 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  6. 2026-10-14 02:56 UTCEG score recompute
  7. 2026-10-14 02:56 UTCVendor advisory
  8. 2026-10-14 02:56 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  9. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  10. 2026-10-12 21:21 UTCEG score recompute
  11. 2026-10-12 21:21 UTCVendor advisory
  12. 2026-10-12 21:21 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  13. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  14. 2026-10-12 15:56 UTCEG score recompute
  15. 2026-10-11 19:40 UTCEG score recompute
  16. 2026-10-11 16:55 UTCEG score recompute
  17. 2026-10-11 14:18 UTCEG score recompute
  18. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  19. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  20. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  21. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  22. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  23. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  24. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  25. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.1% · 1st percentile
Show 75 more
  1. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  2. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  3. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  4. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  5. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  6. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  7. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  8. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  9. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  10. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  11. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  12. 2026-09-18 11:24 UTCEG score recompute
  13. 2026-09-18 11:24 UTCVendor advisory
  14. 2026-09-18 11:24 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  15. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  16. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  17. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  18. 2026-09-14 02:10 UTCEG score recompute
  19. 2026-09-14 02:10 UTCVendor advisory
  20. 2026-09-14 02:10 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  21. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  22. 2026-09-13 12:47 UTCEG score recompute
  23. 2026-09-13 12:47 UTCVendor advisory
  24. 2026-09-13 12:47 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  25. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  26. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  27. 2026-09-09 13:40 UTCEG score recompute
  28. 2026-09-09 13:40 UTCVendor advisory
  29. 2026-09-09 13:39 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  30. 2026-09-09 12:37 UTCEG score recompute
  31. 2026-09-09 12:37 UTCVendor advisory
  32. 2026-09-09 12:37 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  33. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  34. 2026-09-08 16:14 UTCEG score recompute
  35. 2026-09-08 16:14 UTCVendor advisory
  36. 2026-09-08 16:14 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  37. 2026-09-07 13:48 UTCEG score recompute
  38. 2026-09-07 13:48 UTCVendor advisory
  39. 2026-09-07 13:48 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  40. 2026-09-07 12:31 UTCEG score recompute
  41. 2026-09-07 12:31 UTCVendor advisory
  42. 2026-09-07 12:31 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  43. 2026-09-06 20:27 UTCEG score recompute
  44. 2026-09-06 20:27 UTCVendor advisory
  45. 2026-09-06 20:27 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  46. 2026-09-06 19:44 UTCEG score recompute
  47. 2026-09-06 19:44 UTCVendor advisory
  48. 2026-09-06 19:44 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  49. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  50. 2026-09-05 16:25 UTCEG score recompute
  51. 2026-09-05 16:25 UTCVendor advisory
  52. 2026-09-05 16:24 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  53. 2026-09-05 15:43 UTCEG score recompute
  54. 2026-09-05 15:43 UTCVendor advisory
  55. 2026-09-05 15:43 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  56. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  57. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  58. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  59. 2026-09-01 13:42 UTCEG score recompute
  60. 2026-09-01 13:42 UTCVendor advisory
  61. 2026-09-01 13:42 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  62. 2026-09-01 12:18 UTCEG score recompute
  63. 2026-09-01 12:18 UTCVendor advisory
  64. 2026-09-01 12:18 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  65. 2026-09-01 03:37 UTCEG score recompute
  66. 2026-09-01 03:37 UTCVendor advisory
  67. 2026-09-01 03:36 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  68. 2026-09-01 02:42 UTCEG score recompute
  69. 2026-09-01 02:42 UTCVendor advisory
  70. 2026-09-01 02:41 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  71. 2026-08-30 20:34 UTCEG score recompute
  72. 2026-08-30 20:34 UTCVendor advisory
  73. 2026-08-30 20:34 UTCGHSA enrichmentGHSA-x82v-328r-gf3h · GitHub severity HIGH · GitHub CVSS 8.8
  74. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  75. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 1st percentile

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Frequently asked(5)

What is CVE-2026-54099?
CVE-2026-54099 is a high-severity vulnerability; its CVE record was published on June 22, 2026. A flaw was found in the Windows Machine Config Operator (WMCO) for Red Hat OpenShift Container Platform. The WICD CSR auto-approver validates that a Certificate Signing Request contains the organization system:wicd-nodes but does not reject additional organization values such as system:masters. A…
When was CVE-2026-54099 made public?
CVE-2026-54099 was made public on June 10, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on June 22, 2026. EchelonGraph's copy of the record carries a last-modified date of October 14, 2026; the record at its source may have been updated since.
Is CVE-2026-54099 actively exploited?
CVE-2026-54099 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54099?
CVE-2026-54099 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54099?
A fix for CVE-2026-54099 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54099 are linked in the Vendor Advisories panel on this page.

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